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Derivative Financial Instruments (Pretax Impact Of Fair Value Hedge Derivative Instruments On The Consolidated Statements of Income) (Details) - Fair Value Hedging [Member] - Cost of Sales - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Mar. 31, 2018
Apr. 01, 2017
Mar. 31, 2018
Apr. 01, 2017
Gain (Loss) on forwards        
Derivative [Line Items]        
Gain/(Loss) on forwards $ 1 $ (12) $ (6) $ (16)
Gain (Loss) on purchase contract        
Derivative [Line Items]        
Gain/(Loss) on forwards $ (1) $ 12 $ 6 $ 16